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gpio/mxs: use devm_* helpers to make error handling simple

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It uses devm_* helpers to make the error handling of probe clean
and simple.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Shawn Guo 2012-05-04 10:30:14 +08:00
parent 84f3570a96
commit 940a4f7b51
1 changed files with 13 additions and 39 deletions
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52
drivers/gpio/gpio-mxs.c
View file

@ -186,44 +186,29 @@ static int __devinit mxs_gpio_probe(struct platform_device *pdev)
struct resource *iores = NULL; struct resource *iores = NULL;
int err; int err;
port = kzalloc(sizeof(struct mxs_gpio_port), GFP_KERNEL); port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
if (!port) if (!port)
return -ENOMEM; return -ENOMEM;
port->id = pdev->id; port->id = pdev->id;
port->virtual_irq_start = MXS_GPIO_IRQ_START + port->id * 32; port->virtual_irq_start = MXS_GPIO_IRQ_START + port->id * 32;
port->irq = platform_get_irq(pdev, 0);
if (port->irq < 0)
return port->irq;
/* /*
* map memory region only once, as all the gpio ports * map memory region only once, as all the gpio ports
* share the same one * share the same one
*/ */
if (!base) { if (!base) {
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!iores) { base = devm_request_and_ioremap(&pdev->dev, iores);
err = -ENODEV; if (!base)
goto out_kfree; return -EADDRNOTAVAIL;
}
if (!request_mem_region(iores->start, resource_size(iores),
pdev->name)) {
err = -EBUSY;
goto out_kfree;
}
base = ioremap(iores->start, resource_size(iores));
if (!base) {
err = -ENOMEM;
goto out_release_mem;
}
} }
port->base = base; port->base = base;
port->irq = platform_get_irq(pdev, 0);
if (port->irq < 0) {
err = -EINVAL;
goto out_iounmap;
}
/* /*
* select the pin interrupt functionality but initially * select the pin interrupt functionality but initially
* disable the interrupts * disable the interrupts
@ -246,29 +231,18 @@ static int __devinit mxs_gpio_probe(struct platform_device *pdev)
port->base + PINCTRL_DOUT(port->id), NULL, port->base + PINCTRL_DOUT(port->id), NULL,
port->base + PINCTRL_DOE(port->id), NULL, false); port->base + PINCTRL_DOE(port->id), NULL, false);
if (err) if (err)
goto out_iounmap; return err;
port->bgc.gc.to_irq = mxs_gpio_to_irq; port->bgc.gc.to_irq = mxs_gpio_to_irq;
port->bgc.gc.base = port->id * 32; port->bgc.gc.base = port->id * 32;
err = gpiochip_add(&port->bgc.gc); err = gpiochip_add(&port->bgc.gc);
if (err) if (err) {
goto out_bgpio_remove; bgpio_remove(&port->bgc);
return err;
}
return 0; return 0;
out_bgpio_remove:
bgpio_remove(&port->bgc);
out_iounmap:
if (iores)
iounmap(port->base);
out_release_mem:
if (iores)
release_mem_region(iores->start, resource_size(iores));
out_kfree:
kfree(port);
dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err);
return err;
} }
static struct platform_driver mxs_gpio_driver = { static struct platform_driver mxs_gpio_driver = {